本文選題：廢石渣 + 復(fù)合晶核劑��； 參考：《山東建筑大學(xué)》2015年碩士論文

【摘要】：本文利用花崗巖廢石渣為主要原料,經(jīng)過除鐵工藝預(yù)處理后,添加一定量的助熔劑、網(wǎng)絡(luò)調(diào)整劑和形核劑等,采用高溫熔融法制備具有優(yōu)良性能的白色微晶玻璃,白度值92%左右,系統(tǒng)地研究了晶核劑、原料配比及熱處理溫度對廢石渣白色微晶玻璃綜合性能的影響及關(guān)系。實驗采用了復(fù)合形核劑CaF2/Na5P3O10,設(shè)定CaF2/Na5P3O10比例為1/1、1/2、1/3、1/4和1/5,對制備的微晶玻璃樣品進(jìn)行了XRD、SEM表征和性能測試。結(jié)果表明：隨CaF2/Na5P3O10比值的降低,試樣的主晶相由硅灰石相轉(zhuǎn)變成氟磷灰石相,且硅灰石相逐漸減弱；微觀結(jié)構(gòu)方面,試樣析出的晶體呈長條狀和顆粒狀,降低CaF2/Na5P3O10比值,長條狀晶體逐漸減少,顆粒狀晶粒長大,分布均勻；微晶玻璃試樣的力學(xué)性能隨CaF2/Na5P3O10匕值的降低先升高后降低；當(dāng)CaF2/Na5P3O10比值為1/2時,微晶玻璃試樣中氟磷灰石相和硅灰石相分布均勻,結(jié)構(gòu)致密,此時具有較優(yōu)力學(xué)性能,抗折強度134.2MPa,維氏硬度802MPa。確定最佳CaF2/Na5P3O10添加比例為1/2。為了最大程度地利用廢石渣,本實驗設(shè)計廢石渣含量分別為55%、60%、65%、70%和75%進(jìn)行了廢石渣微晶玻璃制備實驗,并對制備的試樣的物相、微觀結(jié)構(gòu)和性能進(jìn)行了分析測試。結(jié)果表明：不同廢石渣含量制備出的白色微晶玻璃的物相種類沒有變化,主晶相為氟磷灰石,次晶相為硅灰石。隨廢石渣含量的增加,XRD圖譜顯示試樣的衍射峰強度先增強后減弱；SEM照片顯示樣品中長條狀晶體數(shù)量先增加后減少,顆粒狀晶粒尺寸增加,廢石渣含量為65%時制備的微晶玻璃結(jié)構(gòu)均勻致密,析晶完全；微晶玻璃的力學(xué)性能隨廢石渣含量的增加先升高后降低,化學(xué)穩(wěn)定性逐漸增強。當(dāng)廢石渣含量為65%時,獲得的微晶玻璃晶相均勻分布,析晶充分,具有較優(yōu)的力學(xué)性能,抗折強度150.6MPa,維氏硬度810MPa。確定最佳廢石渣添加量為65%。根據(jù)DTA曲線,本論文將廢石渣含量為65%,復(fù)合形核劑CaF2/Na5P3O10比值為1/2制備的基礎(chǔ)玻璃在840℃、870℃、900℃、930℃和960℃五組不同的溫度下熱處理,測試制備的微晶玻璃試樣的XRD、SEM及各項性能。研究結(jié)果表明：隨熱處理溫度的升高,氟磷灰石相增強,硅灰石相逐漸減弱；通過SEM分析可知840℃～900℃熱處理時,試樣中長條狀晶體與球形顆粒狀晶粒共存,900℃～960℃熱處理時,長條狀晶體逐漸消失,顆粒狀晶粒均勻分布,但溫度過高會使內(nèi)部出現(xiàn)裂紋等缺陷,導(dǎo)致微晶玻璃的力學(xué)性能降低；試樣的密度和機械強度先升高后降低,化學(xué)穩(wěn)定性先增強后減弱。900℃熱處理時,樣品結(jié)構(gòu)致密,晶體分布均勻,析晶較為完全,密度取得最大值2.77g/cm3,抗折強度150.6MPa,維氏硬度810MPa,具有最優(yōu)的化學(xué)穩(wěn)定性。當(dāng)廢石渣含量為65%,復(fù)合形核劑CaF2/Na5P3O10比值為1/2時的最佳熱處理溫度為900℃。
[Abstract]:In this paper, the white glass-ceramics with excellent properties were prepared by high temperature melting method using granite waste rock slag as the main raw material, adding a certain amount of flux, network adjuster and nucleating agent after pretreatment of iron removal process. The effects of nucleating agent, raw material ratio and heat treatment temperature on the comprehensive properties of white glass-ceramics with waste stone slag were systematically studied. The composite nucleating agent CaF _ 2 / Na _ 5P _ 3O _ (10) was used, and the ratio of CaF _ 2 / Na _ 5P _ 3O _ (10) was set to be 1 / 1 / 1 / 2 / 3 / 3 / 4 and 1 / 5 respectively. The prepared glass-ceramics samples were characterized by XRDX SEM and their properties were tested. The results show that with the decrease of CaF _ 2 / Na _ 5P _ 3O _ 10 ratio, the main crystalline phase changes from wollastonite phase to fluoropatite phase, and the wollastonite phase decreases gradually, and the precipitated crystals are long and granular, which decreases the ratio of CaF _ 2 / Na _ 5P _ 3O _ (10), and decreases the ratio of CaF _ 2 / Na _ 5P _ 3O _ (10). The mechanical properties of glass-ceramics increased with the decrease of CaF _ 2 / Na _ 5P _ 3O _ (10) and then decreased, when the ratio of CaF _ 2 / Na _ 5P _ 3O _ 10 was 1 / 2, The fluoroapatite and wollastonite phases in glass-ceramics are uniformly distributed and have dense structure. At this time, they have better mechanical properties, the flexural strength is 134.2 MPa, and the Vickers hardness is 802MPa. The best addition ratio of CaF2 / Na5P3O10 is 1 / 2. In order to make the best use of the waste stone slag, the content of the waste stone slag was 55. 60% and 65% respectively. The glass-ceramics preparation experiment of the waste stone slag was carried out. The phase, microstructure and properties of the sample were analyzed and tested. The results showed that the white glass-ceramics prepared with different content of waste stone slag had no change in phase, the main crystal phase was fluoroapatite, and the secondary phase was wollastonite. With the increase of waste slag content, XRD pattern showed that the diffraction peak intensity of the sample first increased and then weakened. SEM photos showed that the number of long stripe crystals in the sample first increased and then decreased, and the grain size increased. The structure of the glass-ceramics was uniform and dense when the content of waste slag was 65. The mechanical properties of the glass-ceramics increased first and then decreased with the increase of the content of waste slag, and the chemical stability increased gradually. When the content of waste slag is 65, the obtained glass-ceramics have uniform distribution of crystal phase, sufficient crystallization and excellent mechanical properties. The flexural strength is 150.6 MPA, and the Vickers hardness is 810 MPA. The optimum amount of waste slag is 65. According to the DTA curve, the basic glass prepared by the composite nucleating agent CaF _ 2 / Na _ 5P _ 3O _ 10 was heat treated at 840 鈩，

本文編號：2089250